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Thread: 400 Turbo Question.

  1. #1
    Member JOURNEYMAN
    Join Date
    Nov 2005
    Location
    Baltimore
    Posts
    30

    400 Turbo Question.

    What is the 2.75 first gear used for is for a Heavy car or light car is it better for the launch. What does it improve.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Dec 2004
    Location
    austin texas
    Posts
    729

    400

    2.75 is for something really heavy or with low torque. If you put a 1000hp engine and a th400 with 2.75 first gear, in something under 2200 lbs, when you leave the lights you will either blow the tires or shake your self to death by notting up the tires?

    Light cars with high power usally run powerglides, with a 1.76-1.90 first gear. These cars have enough power to launch hard from the tree with out needing the additional gearing, or a 3 speed transmission.

    I hope this helps, im no pro, just my two cents...

  3. #3
    Senior Member RACING JUNKIE fla1976's Avatar
    Join Date
    Aug 2007
    Posts
    1,527

    2.75

    I found that the 2.75 is great with a small block because of the limited torque. If you build a torquey small block or run a big block , it isn't necessary.

  4. Racing Junk


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